Have a b&s 12 hp old model need to place engine. Have to use the pulleies on the new one to make it work. Any ideas on how to remove them off the shaft and on the newer one.

A box of mass 1kg and a bag of mass 2kg are suspended from a rope passing over a pulley of moment of inertia 0.02kg*m^2 and radius 10cm. The rope does not slip with respect to the pulley. The bag is released from rest at a height of 2cm above the floor. Find the speed of the bag whe it hits the...

Can anyone give me some pointers on replacing the engine pulley on my craftsman riding lawn mower which is about 11 yrs. Old. The bolt in the center of the pulley needs to be removed to replace the pulley but the entire pulley turns when I try to loosen the bolt. Any suggestions?

My buddy has a 88 GMC pick-up truck and his AC pulley seized up. Any help on pulling this out?